The department added that the weak northeast monsoon prevailing across the Gulf of Thailand and the South will bring less rain to the areas, while waves in the Gulf will rise about a metre high and 1-2 metres during thundershowers.
During December 15-18, another high pressure cell from China will extend to cover upper Thailand, bringing cool to cold weather with strong winds and a 2-3°C drop in temperature over the upper country.
The weather forecast for the next 24 hours:
North: Cool to cold weather with fog in the morning and dense fog in some areas; minimum temperature 12-18 degrees Celsius, maximum 29-35°C; temperature on hilltops is likely to drop to 4-13°C.
Northeast: Cool weather with fog in the morning and dense fog in some areas; minimum temperature 16-22°C, maximum 31-33°C; temperature on hilltops is likely to drop to 8-12°C.
Central: Cool weather and fog in the morning; minimum temperature 19-22°C, maximum 32-35°C.
East: Cool weather in the morning; minimum temperature 24-25°C, maximum 32-35°C; waves a metre high and 1-2 metres off shore.
South (east coast): Partly cloudy with thundershowers in 10 per cent of the areas; minimum temperature 21-24°C, maximum 30-33°C; waves a metre high and 1-2 metres during thundershowers.
South (west coast): Partly cloudy with thundershowers in 10 per cent of the areas; minimum temperature 22-25°C, maximum 32-34°C; waves a metre high and 1-2 metres during thundershowers.
Bangkok and surrounding areas: Fog in the morning; minimum temperature 23-24°C, maximum 32-34°C.